My Question is ...
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Is there any way, that we can Retrieve Topics List and Items List from DDE Server Application, so that we write "Advice requests" for all the items/topics
at coding time ?

What if these changes time to time on source ??
How can we prevent our vb.net application to become "Hard Coded" because DDEitems on DDEServer may change any time when new contracts arrive ?

Why would you ever need such outdated stuff? I was proud of not using it even when it was introduced; even then it looked very questionable (I mean Microsoft DDE/NDDE, not Codeplex NDDE). Why not using TCP/IP? Legacy stuff?
--SA